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Variable Interest Entities and Securitization Activities (Narrative) (Details) (USD $)
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6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Apr. 02, 2012
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|
| Noncontrolling interest | $ 1,734,000,000 | $ 1,653,000,000 | ||
| Additional maximum exposure to loss | 120,000,000 | 200,000,000 | ||
| Securities issued by SPEs | 3,800,000,000 | |||
| Proceeds from new securitization transactions | 9,200,000,000 | 15,000,000,000 | ||
| Proceeds from cash flows from retained interests in securitization transactions | 1,700,000,000 | 3,900,000,000 | ||
| Intangible assets, fair value | 8,000,000 | 133,000,000 | ||
| Servicing advances, net of reserves | 24,000,000 | 1,296,000,000 | ||
| Servicing advances, reserves | 7,000,000 | 14,000,000 | ||
| Mortgage servicing rights | 8,000,000 | 133,000,000 | 84,000,000 | |
| Fair value of mortgage servicing rights sold | 119,000,000 | 84,000,000 | ||
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Residential Mortgage-backed Securities
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| Securities issued by SPEs | 900,000,000 | |||
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U.S. Agency Collateralized Mortgage Obligations [Member]
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| Securities issued by SPEs | 900,000,000 | |||
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Commercial Mortgage-backed Securities
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| Securities issued by SPEs | 700,000,000 | |||
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Collateralized Debt Obligations
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| Securities issued by SPEs | 500,000,000 | |||
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Consumer Loans
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| Securities issued by SPEs | $ 800,000,000 | |||